The Jeep-Mobile is a green variant of the S.U.B. that is most likely the factory version. It has riveted panels of metal, a green paint job, and an acorn license plate. It has the roll-cage present on the S.U.B. and a large cargo area.
Role in episode
SpongeBob and Patrick find out that Sandy is going camping and they want to go with her to camp. She says its too dangerous for them, and turns them down. However, SpongeBob and Patrick both hide in the trunk of the Jeep-Mobile, but they accidentally fall out in the middle of the Kelp Forest with some supplies.
Instead of a tailgate, the Jeep-Mobile and perhaps the S.U.B. have a door on the back of the truck that allows easier access to the cargo area.
The actual front of the boat is never shown. The closest is a side view early in "To Save a Squirrel."